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Non-linear finite element investigation of formability limit by buckling in creep age forming of stiffened panels

机译：加强面板蠕变时代成型屈曲的非线性有限元调查

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This paper focuses on the prediction of the formability limit of the stiffened panels during the loading stage and heating stage of the creep age forming (CAF) process. A set of non-linear finite element (FE) simulations has been carried out to investigate the elastic-plastic buckling behaviour of stiffened panels subjected to pure bending at the room temperature and the ageing temperature (155°C) for AA2050. From the nonlinear FE simulations, the effects of main geometric parameters (stiffener thickness and stiffener height) on the critical buckling stress and the critical radius of the stiffened panel have been investigated at both temperatures. Increasing the stiffener thickness or decreasing the stiffener height leads to an increase of the critical buckling stress and an increase of formability limit. The critical buckling stress at the ageing temperature is smaller than that at the room temperature when the stiffened panel enters the plastic region, however, the formability increases slightly at the ageing temperature.
机译：本文侧重于预测加载阶段和加热阶段在蠕变年龄形成（CAF）过程的加热阶段的加强面板的可成形性极限。已经进行了一组非线性有限元（Fe）模拟，以研究在室温下对纯弯曲的加强面板的弹性塑料屈曲行为和AA2050进行衰老温度（155℃）。从非线性FE模拟中，在两个温度下，研究了主要几何参数（加强件厚度和加强件高度）对临界屈曲应力和加强面板的临界半径的影响。增加加强件厚度或降低加强件高度导致突出屈曲应力的增加和成形性极限的增加。然而，当加强面板进入塑料区域时，衰老温度的关键屈曲应力小于室温时的突出应力。然而，在衰老温度下可成形性略微增加。

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